[AcerbicZero]

A bit old, but still relevant - http://archive.gao.gov/f0302/109884.pdf

I'm no expert on the topic, but it seems to me that if heavily loaded trucks are causing a disproportionate amount of damage they should be taxed at a rate which allows for proper maintenance of those roads.

[scarmig]

You know all those weigh stations you see on the road and don't have to stop at?

They're not decorative.

[ams6110]

Trucks are taxed more already. The problem is legislatures using those tax revenues for other pork and then claiming to not have enough money for roads.

[jessaustin]

Semi trucks reduce the quality of the roads much more than lighter vehicles do. The slightly greater tax they pay doesn't begin to make up for it.

http://fhwicsint01.fhwa.dot.gov/policy/hcas/addendum.cfm